Commits on Mar 9, 2022

1. Skip db name parsing if mts_accessed_dbs == 254 …

   I interpreted `mts_accessed_dbs` as db count in PR#360 (released in 0.27).
   However after reproducing kvitek's exception in Issue#278,
   I did some more research how it is set:
   https://github.com/mysql/mysql-server/blob/6846e6b2f72931991cc9fd589dc9946ea2ab58c9/sql/log_event.cc#L3598-L3602
   (log_event.h /log_event.cc is responsible for writing low-level binlog,
   according to
   https://dev.mysql.com/doc/internals/en/source-files-related-to-the-binary-log.html)
   
   Turns out that if the value of the variables equals 254,
   the variable is no longer interpreted as the db count,
   but represent a following case:
   1. db count equals 1
   2. The name of the only db is blank.
   
   Therefore, I edited event.py so that after the value 254 is encountered,
   no further parsing is done regarding db names.
   
   So far I have reproduced the issue for `BeginEvent`.
   However, I have not yet figured out to incorporate into unittest.
   I will add tests ASAP.

   

   dongwook-chan committed Mar 9, 2022
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